[teal]

U.S. Constitution. Article I, Section 8: The Congress shall have the power to... ...regulate commerce with foreign nations, and among the several states, and with the Indian tribes;

If somone calling me from one state with the purpose of conducting commerce with me in another state is not "commerce among the several states" I don't know what is. The Federal donot call list is perfectly constitutional (except perhaps in the case where both telemarketer and telemarketee are in the same state).